The 24-year-old senior sales consultant was responding to allegations that she had a boob job when she was 17 to improve her self-esteem.
Barr told the Daily Mail: "I never talk about my boobs - and if you haven't seen or touched them you can't have an opinion."
Regarding rumours of a sex tape, she added: "If there had been a video, it would be all over YouTube by now, wouldn't it?
"It's a stupid assumption that if you're strong and tenacious in business you have to be swinging from the chandeliers in your private life. Anyone who knows me would tell you, if I wanted to be a lesbian, I'd be one. But I'm not."
> Click here to read our interview with Debra, James and Lorraine